Skip to main content
. 2019 Jul 5;24(13):2476. doi: 10.3390/molecules24132476

Figure 2.

Figure 2

(a) Energy level diagram of upconversion nanoparticles (UCNPs): NaYF4: Yb3+, Tm3+; (b) Visible spectral range image of UCNPs photoluminescence in hexane; (c) Corrected apparatus function spectrum of the UCNPs under near-infrared (NIR) excitation at 975 nm at intensity 10 W/cm2 (line centered at 800 nm multiplied by coefficient 0,01).